Thermoresponsive ketoprofen-imprinted monolith prepared in ionic liquid
- 443 Downloads
A thermoresponsive imprinted monolith with the ability of molecular recognition for ketoprofen was prepared for the first time. The smart monolith was synthesized in a stainless steel column using acrylamide (AAm) and 2-acrylamide-2-methyl propanesulfonic acid (AMPS) as functional monomers, which can form interpolymer complexation to restrict access of the analyte to the imprinted networks at low temperatures. To avoid a high back pressure of the column derived from neat dimethyl sulfoxide (DMSO) as a porogenic solvent that is needed to solve polar AMPS, an ionic liquid, [BMIM]BF4, was introduced into the pre-polymerization mixture. The molecular recognition ability towards ketoprofen of the resulting thermoresponsive molecularly imprinted polymer (MIP) monolith displayed significant dependence on temperature compared with a non-imprinted column (NIP), and the greatest imprinting factor was achieved at the transition temperature of 35 °C (above 10). Furthermore, the number of binding sites of the smart MIP monolith at 35 °C was about 76 times as large as that at 25 °C. In addition, Freundlich analyses indicated that the thermoresponsive MIP monolith had homogeneous affinity sites at both 25 and 35 °C with heterogeneity index 0.9251 and 0.9851, respectively.
KeywordsMolecularly imprinted polymer Ketoprofen Monolith Thermoresponsive Molecular recognition
This work was supported by the National Natural Science Foundation of China (Grant No. 21375096).
- 1.Yan M (2004) Molecularly imprinted materials: science and technology. CRC PressGoogle Scholar
- 2.Sellergren B (2000) Molecularly imprinted polymers: man-made mimics of antibodies and their application in analytical chemistry. ElsevierGoogle Scholar
- 23.Fang L, Chen S, Zhang Y, Zhang H (2011) J Mater Chem 21:2320Google Scholar